Magnesium and calcium levels

[Metrontech]

Hey guys and gals

Hoping someone can help

My levels are barely lowering week over week

My magnesium haven't gotten under 1400 and my calcium isn't going under 450

I am not dosing, I'm using pharmaceutical grade crystals with 5/3 mix for Mag

I read about people dosing, if I dose I would overload my tank

I'm keeping lps, softies and an anemone (which is doing really well )

Using a 300w led fixture

ALK ranges from 9-10

Salinity 1.025

Thanks for any input!